Hi Dave and Tim,

I loaded CommandShell and use it because I like the idea of being able to test if the command
"worked".  I wanted to have the shutdown/reboot to wait a few seconds before kicking in because
I want the session to logoff and the browser to understand that the session is done and not
keep talking to it.  I played around a lot and ended up with having to use the shutdown option
that waits 1 minute, as there doesn't seem to be a working way (-t should wait seconds but
waits minutes) to wait some number of seconds.

Anyway, other than the reboot (which shouldn't be used often) taking longer than I like I am
please with the way it all works.  If you like you can see the code below.

Thanks again.

Lou


shutdown
	"Shutdown the computer."
	| shell |

	shell := CommandShell new.
	shell if: 'sudo shutdown -P 1'
		then: [self logoffAndQuit]
		else: [errorMessage := 'Shutdown failed: ', shell errorStream contents].


reboot
	"Reboot the computer."
	| shell |

	shell := CommandShell new.
	shell if: 'sudo shutdown -r 1'
		then: [self logoffAndQuit]
		else: [errorMessage := 'Reboot failed: ', shell errorStream contents].

logoffAndQuit
	"Logoff and quit out of Squeak."

	self logoff.
	[
		(Delay forSeconds: 5) wait.
		Smalltalk snapshot: false andQuit: true.
	] fork.

note: errorMessage will be display on the current screen when there is an error.


On Thu, 9 Mar 2017 19:36:20 -0500, "David T. Lewis" <lewis at mail.msen.com> wrote:

>On Thu, Mar 09, 2017 at 06:53:31PM -0500, Louis LaBrunda wrote:
>> Hi Dave and Tim,
>> 
>> Thanks for all the help.  I'm running Raspbian Jessie Lite (no desktop or GUI) and Squeak
>> headless.
>
>OK good, in that case I don't think you need to worry about entering a password for sudo.
>
>
>> On boot I auto run Squeak.  Given that I didn't load CommandShell, which I think is
>> a GUI interface.
>
>CommandShell is not a GUI interface, although it does provide one for both
>Morphic and MVC.  Mainly it is a simulation of a simple Unix shell, connected
>to OSProcess for running the external commands.
>
>Here is something that might do what you want:
>
>  shell := CommandShell new.
>  shell if: 'sudo shutdown -P now'
>        then: [ Smalltalk snapshot: false andQuit: true ]
>        else: [ self error: shell errorStream contents ].
>
>This should ensure that the shutdown command has run successfully before you
>quit the image. I am pretty sure that the quit will happen before the OS has
>a chance to kill it as a result of the shutdown command, so I don't think you
>need to worry about timing.
>
>Dave
>
>
>>  Squeak auto runs a Seaside program that only has one user so there is a
>> password but no user id.  There is a setting screen and a main screen that allows the user to
>> control up to 4 relays and view the status of up to 4 sensors/switches.
>> 
>> This first pass is going to a friend where we will install it to control his garage doors thru
>> the internet via a smart phone (or any browser).  I want to be able to reboot and shutdown from
>> the browser just because sometime you need to.
>> 
>> The reboot and shutdown code I used is below.  Just before calling those methods, I call a
>> method to logoff from the web session.
>> 
>> I'm not sure I need to but it seemed prudent to quit Squeak before shutting down.  I wait 10
>> seconds to give the logoff time to paint.  I wanted to have the shutdown delay for a few
>> seconds with the "-t sec" option but on Raspbian the sec option is taken as minutes (seems like
>> a bug to me).  Anyway the "now" option seems to give Squeak enough time to quit without a
>> problem.
>> 
>> Thanks again for the help.
>> 
>> Lou
>> 
>> reboot
>> 	"Reboot the computer."
>> 
>> 	[
>> 		(Delay forSeconds: 10) wait.
>> 		UnixProcess thisOSProcess command: 'sudo shutdown -r now'.
>> 		Smalltalk snapshot: false andQuit: true.
>> 	] fork.
>> 
>> shutdown
>> 	"Shutdown the computer."
>> 
>> 	[
>> 		(Delay forSeconds: 10) wait.
>> 		UnixProcess thisOSProcess command: 'sudo shutdown -P now'.
>> 		Smalltalk snapshot: false andQuit: true.
>> 	] fork.
>> 
>> On Wed, 8 Mar 2017 20:17:06 -0500, "David T. Lewis" <lewis at mail.msen.com> wrote:
>> 
>> >On Wed, Mar 08, 2017 at 07:33:18PM -0500, David T. Lewis wrote:
>> >> On Wed, Mar 08, 2017 at 04:23:45PM -0800, tim Rowledge wrote:
>> >> > 
>> >> > > On 08-03-2017, at 4:07 PM, David T. Lewis <lewis at mail.msen.com> wrote:
>> >> > > 
>> >> > > 
>> >> > > Having said that, I suspect that the reboot is going to be tricky.
>> >> > > The sudo command is designed for security, and it is smart enough not
>> >> > > to let the password input come from some arbitrary input stream such as
>> >> > > the one connected to your Squeak image. I'll try tinkering around with
>> >> > > it a bit, but I'm afraid this may not be not as simple as you might expect.
>> >> > Actually on a Pi ???sudo??? is normally password-free, wjich is probably enough to make some people???s heads explode, but there y???are.
>> >> >
>> >> 
>> >> Yes, on raspbian it will probably work. The tricky bit is that if you do
>> >> need to enter a password, sudo will read the password from the controlling
>> >> terminal the Squeak VM process, represented by /dev/tty. That more or less
>> >> equates to your keyboard. There is no easy way for Squeak to insert a keyboard
>> >> wedge to supply the password keystrokes, which of course is exactly what
>> >> was intended from a security point of view.
>> >>
>> >
>> >Actually, that reminds me - and I want to mention it now before I forget about
>> >it yet again - I think that the sudo password input issue might be effectively
>> >handled with the unix pseudo terminal interface (man 7 pty). Ian Piumarta made
>> >a plugin for this along with his really quite amazingly good telnet terminal
>> >emulator.
>> >
>> >That stuff, along with other things such as the VNC server, is still available here:
>> >
>> >  http://squeakvm.org/unix/goodies.html
>> >
>> >I also recall Ian asking me a long time ago why I didn't add pty support to
>> >the OSProcess plugin, which was a very good question, and I probably should have
>> >paid attention to it.
>> >
>> >Dave
>> > 
>> >
>> -- 
>> Louis LaBrunda
>> Keystone Software Corp.
>> SkypeMe callto://PhotonDemon
>> 
>> 
>
-- 
Louis LaBrunda
Keystone Software Corp.
SkypeMe callto://PhotonDemon